Nehemiah dodge



UNITED STATES PATENT OFFICE.

NEHEMIAH DODGE, OF NEW YORK, N. Y.

PUMP-VALVE.

Specication of Letters Patent No. 9,706, dated May 10, 1853.

To all whom t may concern:

Be it known that I, NEHEMIAH DODGE, of the city, county, and State of New York, have invented a. new Improvement in the Shape of the Flat Valve now in Common Use; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification. i

The nature of my invention consists in forming an arched valve whose curvature is the same as that of the barrel of the pump itself. Its form may be thus described: Suppose two planes passed through the barrel of the pump (see Figure X, A B', A B), and suppose the part of the pump above them, removed; then the lines X-X- T Fig. X, will represent, in project-ion, the seats of my curvilinear valve. Now you cut and bend a piece of thin metal, that, when hinged by one vertex (see A, hinged at Z) Fig. X) to the interior of the barrel, it will t on said seat (as at Fig. Y) and prevent the passage of fluid; and when open (as seen at Fig. X), it conforms to the bore of the pump, allowing the great/est pessiblev egress.

A, is a perspective view of the valve and is its axes on which itturns in a socketcl, formed by part of O and E; C is the valve seat and main part of the box; cl, is the socket for A to work in. E forms a part of the socket d, also can be used for a part o-f the staple and be formed with a dovetail to hold to G; and F, is also a part of the staple; Gr, is a bottom ring holding the hy draulic packing I, on the outside of the box; H, are grooves formed for holding the box together, and I, is a leather packing to make the box water tight so as to operate in common pumps like those in common use except being made of metal instead of wood and much thinner; also the valve being crooked and of metal it can be formed into a segment one way, by bending its edges down and inward till it foi-ms about half of a circle, so that its outside will fit the inside of its chamber when open, and when shut it will form an arch across it one way.

The advantages are, first, being made of thin metal it will not need as much room in the pump chamber for it to work in; second, that a pump with this box need not be made over one inch larger above its boxes than it is below thereby saving a large expense in cost; third, in a pump eighty feet long the suction is about thirty feet, making the lifting part fifty, so that a pump of four inches in diameter above its boxes holds only two hundred and twenty-five pounds of water, while the old one which must be six inches to accommodate it-s flat valves, will hold over four hundred pounds which has to be lifted at every stroke, whereby you will perceive that there is a vast amount of power saved by the thin crooked valve connected with the smallest chamber in which no other can work. It can also be used in any pipe without much increase in size where it is wanted to prevent the return of hot air, steam or any other liquid.

Vhat I claim is- An arched valve formed by passing two planes, inclined to each other, throughY a semicylinder, of the same diameter with the bore of the pump-the sectional valve thus formed, being hinged by one vertex, to the interior of the bore for the purpose hereinbefore substantially set forth.

NEHEMIAH DODGE.

Witnesses:

J. C. DEVEREUX, COR. R. DisoswAY. 

